听力原文:M: Would you pass me the sports section,please? W: Sure, if you give me the classified ads and local news section. Q: What are the speakers doing? (19)
【简答题】如图所示液压回路,已知液压泵的流量 q p =10L/min ,液压缸无杆腔活塞面积 A 1 =50cm 2 ,有杆腔活塞面积 A 2 =25cm 2 ,溢流阀调定压力 P y =2.4Mpa ,节流阀通流面积 A T = 0.01cm 2 ,负载 F L =10000N ,求回路中活塞的运动速度和液压泵的工作压力。(设 C d = 0.62 ,ρ = 870kg/m 3 ,节流阀口为薄壁小孔。)...